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杂交稻制种田中不育系与恢复系的主茎总叶片数一般相差5～7片左右,为了使两亲本同时抽穗开花,提高异交结实率,一般都人为地错开两亲本的播种期(不同组合都有相应的播差期)。但往往由于气候、管理措施等诸因素的影响,而导致两亲本最后开花时间仍不能吻合,这种不吻合只有在穗分化的一次枝梗原基分化期到颖花分化期(俗称2～3期)才被发现。此时采取一系列调整花期措施,有时在不得已
In general, the total number of main stems of CMS lines and restorer lines in hybrid rice farming is about 5 ~ 7, in order to make the parents at the same time heading and flowering and improve the rate of outcrossing and seeding, Different combinations have a corresponding sowing period). But often due to climate, management measures and other factors, which led to the final flowering of the parents can not match, this does not match only in the panicle differentiation of primary branch differentiation to spikelet differentiation (commonly known as 2 ~ 3 Period) was discovered. At this time to take a series of measures to adjust the flowering, sometimes last resort